Note 16 - Assets and Liabilities Measured and Reported at Fair Value - Significant Unobservable Inputs (Details) - Impaired Loans [Member] - Fair Value, Inputs, Level 3 [Member] - Appraisal Discount Method [Member] $ in Thousands	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Impaired loans - collateral dependent, fair value	$ 348	$ 925
Other real estate owned	$ 239	$ 239
Weighted Average [Member]
Impaired loans - collateral dependent, weighted average of input	0.100	0.099
Other real estate owned - collateral dependent, weighted average of input	0.220	0.220